pls help with part b.

Determine the amount to be pald in full settiement of each of two involces, (o) and (b), assuming that credit for returns and allowances was received prior to paymant and that all invoices were paid within the discount period. If required, round the answers to the nearest dollat. a. b. $ roteckwon o \& b. Under FOB shipping point, freight is paid by the buyer, while under FO\& destination freight is the soller's expense. To determine the amount, first deduct the return before calculating the discount. Then calculate (Purchase - Retum - Discount) + applicable freight